Comparison of deflection and modulation characteristics of symmetrically and asymmetrically electroded electro-optic devices

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Abstract
Electro-optically induced phase-grating-type devices may be used for deflection and modulation of an incident optical beam. Experimental observations of the variations of the electrical input impedance suggests that by judicious selection of the crystal dimensions and the relative spacings of the electrodes, the acoustic resonances occurring in the devices when operated in AC conditions can be suppressed. The advantages in using an asymmetrically electroded arrangement over the symmetrically electroded arrangement for light-beam modulation and deflection are discussed in this paper.